What does a crumhorn look like?

A Crumhorn is a crook shaped instrument

Crumhorn comes from the German krumhorn (krummhorn, krumphorn), which means curved horn.

The reed is a double reed and looks similar to an oboe or bassoon, the leads down to a pipe, curved at the end into a half circle.

http://www.courtlymusicunlimited.com/HistoricWinds/Crumhorn-1.html